DRILL-8028: Add PDF Format Plugin (#2359)
* Initial commit
* WIP
* Regular queries working
* Metadata fields working
* Minor fixes
* Fixed unit test
* Added additional closing functions.
* WIP
* Fixed Headless Issue
* Updated to Drill 1.20
* Added option to merge pages
* Ready for PR
* Removed struts
* WIP
* Progress..
* UTs all passing
* Fix Duplicate Page Issue
* Fixed extract headers
* Refactored Tables and Added Metadata class
* Added UT
* Code cleanup
* New UTs
* Added UTs
* Added UT and removed extra test files
* Removed comment
* Removed comment
* Bump pdfbox to latest version
* Moved Java config to drill-config.sh
